Preparation And Properties Of Alkaline Fuel Cell Electrolyte Based On Hyperbranched Polymers

Energy research had been receiving more and more recognition in recent years, so fuel cell became the hot spot because of its environmental friendliness, high efficiency, etc. Especially alkaline anion membrane fuel cell (AEMFC) becomes a focus, which had numerous advantages, such as low cost, wide range of catalyst selection, low corrosive, etc. As core component of AEMFC, the performance of alkaline anion exchange membrane and ionomer would directly affect the application of fuel cells. At present, iomomer exist some drawbacks of poor solubility and low conductivity, and alkaline anion exchange membrane also exist some drawbacks of low conductivity and poor stability, which limit the develop of AEMFC. The main purpose of this article is to prepare the ionomer and blended alkaline anion exchange membranes based on self-synthesised hyperbranched polymer and carry out a systematic research on varies properties.First, hyperbranched polyaryletherketone (HBPAEK) with fluorine end group was synthetized by "A2+B3" polymerization method. Furthermore HBPAEKG with abundant tertiary amine groups were prepared by end group modification of HBPAEK. The results of IR and1H-NMR characterization confirm the polymer’s structure.Second, HBP-ionomers were prepared after alkylating and base exchange, which using methyl iodide and bromine and n-hexane as alkylating agent. The ionomer can dissolve in THF, and its IEC can reach to3.29mmol/g.BAEM were carried out by blend and crosslinking of hyperbranched polymer and CMPPEK. The relationship between BAEM’s properties such as swelling ratio, water uptake, crosslinking degree and conductivity were investigated. The conductivity of BAEM reached2.23×10-2S·cm-1at30℃, and swelling ratio of the BAEM is very small in length/width and thickness direction (2.3%,2.1%,7.8%respectively), simultaneously the BAEM performed good thermostability and chemical stability...